The Samsung Galaxy A7 (2017) feature an Always On display. This is not a new technology, but it's great to see it in the A-series. An Always On Display means that you get to see the time, how much battery percentage is left and calendar without having the need to wake up the phone from it's standby mode. This feature is very useful for two main reasons: it saves time, so you don't need to wake the phone up or unlock it to get access to some basic information and second, is saves battery because only a snippet of information is being displays.
When you press a button on the right side, the screen will dim out and after like three seconds, the screen will display the date, time and how much battery is left in a pale white color over a black background. By the way, this black background is actually pixels which are turned off. The Samsung Galaxy A7 2017 has a Super AMOLED display and it is used for this purpose of being able to display information only for certain pixels on the screen.
I really like this Always On Display technology and I think it should find itself in more phones. In 2017 we are going to see many mid-range phone inheriting many of the high-end feature from the more expensive models, as those models are being replaced by even more unique and innovative features.
Here is a video by MobileReviewCom (in Russian), talking about the A3, A5 and A7 2017 models, but you can see how the Always On Displays looks like.